Hey Tim,
It's always nice to get to know more people and their techniques.
I am working as a Lead Animator for Studio Fizbin in Germany. We use Spine with Unity to create animations for our point and click adventure The Inner World 2. After having tried a couple of different techniques (frame by frame spritesheets in Inner World 1) we settled for Spine, because the support and bug fixing is super fast and the list of features is so long (paths and constraints have become very valuable to us).
Nima does indeed look very interesting, but when I tested it some important features were missing (most notably switching attachments).
Is your game the one on Armor Games?
All the best,
Ferdinand